Hot-air generators from amba enterprises are specially manufactured for several applications. With capacities of 0.174 mw to 60 mw and working temperature ranging from 150 c to 800 c these are widely used in drying processes in various industries including soil, chemical, fertilizer, sugar, paper, packaging, metal, cement, etc. Apart from that these are also used as start-up combustor for fluidized bed furnaces; generation of hot gases required to reheat flue gases; and combustor with heat exchanger to heat up process gases. It has several benefits such as relatively short heating up times & good control possibilities; short mounting timers due to the small total weight; minimum loss of heat, double shell design allows to recover a great deal of heat flow; no need of drying & warming up; individual process-dependent control possible because of practically no stored heat; wide range of control; low operating cost; and ability to heat combustion air up to 100 c to 120 c to gain combustion efficiency.